General Information:
Chemical Formula:Ca2Mn++Mn+++2Si3O10(OH)4
Composition:(Molecular Weight = 557.25 gm)Calcium 14.38 %
CaManganese 29.58 %
MnSilicon 15.12 %
SiHydrogen 0.72 %
H Oxygen 40.20 %
O Empirical Formula: Ca2Mn2+Mn3+2Si3O10(OH)4
Locality:Oriente Province, Cuba.
Name Origin:Named after its locality.
Physical Properties: Cleavage:[001] Indistinct, [120] Indistinct
Color:brown or black.
Density:3
Diaphaniety:Translucent to opaque
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:4-5 - Fluorite-Apatite
Luster:Vitreous (Glassy)
Streak:brown
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